JP5555583B2 - Data recording method, optical disc recording / reproducing apparatus, and optical disc - Google Patents

Description

  The present invention relates to a technique for recording on an optical disc.

  A high-density recording / reproducing optical disc such as a write-once Blu-ray disc (BD-R) has a structure in which a recording layer, a reflective layer, and, if necessary, a protective layer are formed on one surface of a light-transmitting disc-like substrate have. Further, a spiral or concentric groove called a groove is formed on one surface of the substrate on which the recording layer and the reflective layer are formed, and a convex shape called a land is formed between adjacent grooves. . In such a high-density recording / reproducing optical disk, the optical disk recording / reproducing apparatus irradiates the recording layer on the groove while tracking the recording laser along the groove, and length nT (reference channel clock period T Pits (hereinafter referred to as recording marks) having an integer n times as long as nT, and a portion having a length of nT and a portion between the recording marks (hereinafter referred to as spaces). Is recorded. The recorded data is reproduced by converting the reflected light into a reproduction signal by the optical disk recording / reproducing apparatus irradiating the reproducing laser beam to the array of these recording marks and spaces.

  Further, when data is recorded on the optical disc as a recording mark or space code, the recording laser pulse is controlled to be a pulse train including a single or a plurality of short pulses. For example, in the case of a short recording mark such as a recording mark having a length of 2T among the recording mark codes having a length of nT, a single pulse pattern is often used. On the other hand, when writing a recording mark having a length of 4T or more, a plurality of short divided pulse patterns are often used. Thus, the recording accuracy is further improved by outputting the pulse of the recording laser in a modulated waveform and suppressing the influence of thermal accumulation and thermal diffusion on the recording surface of the optical disk. Such a recording laser irradiation condition is called a write strategy or simply a strategy.

  Conventionally, recording is performed using a castle-type recording pulse (Write Pulse) at a quadruple speed of the standard recording speed (linear velocity: 4.92 m / s). FIG. 1 schematically shows a castle type recording pulse waveform. In FIG.1 (c), a vertical axis | shaft represents an amplitude and a horizontal axis represents time. In FIG. 1C, the space forming power Ps, which is the recording power necessary for forming the space, is used at the time of forming the space, the write power Pw is used at the time of forming the mark, and the mark after the top pulse is used in the mark of 3T or more. An intermediate bias power Pm is used for the pulse, and a cooling pulse power Pc is used for the cooling pulse that is a downward pulse after the last pulse of the mark. The write power Pw is also used in the last pulse. Note that the laser power during reproduction is also shown in FIG. 1C as read power Pr.

  1A shows recording data (2T mark (P2T) and 8T mark (P8T)), and FIG. 1B shows a clock signal waveform. FIG. 2 shows an example of an actual castle type recording pulse waveform. In FIG. 2, the horizontal axis represents time and the vertical axis represents power.

  In the castle type recording pulse waveform, the last pulse of the write power Pw higher than the intermediate bias power Pm is provided at the end of the pulse waveform. However, when performing higher speed recording, the laser may not be able to output the last pulse. There is sex. Instead of the ideal rectangular recording pulse waveform as shown in FIG. 1, a waveform having distortion is actually output as shown in FIG. 2, and the top pulse length, intermediate pulse length, and last pulse length are output. It is difficult to secure enough. Naturally, the waveform is more distorted in the case of higher speed recording.

  In addition, the minimum period of one pulse period (a section from the power switching point to the next power switching point) is normally 2.0 ns. However, as shown in FIG. 3, which shows how much time each T corresponds to at 4 × speed, 6 × speed, and 8 × speed, 9 / 16T or more is required at 4 × speed to secure 2.0 ns. For 6 × speed, 13 / 16T or more is required, and for 8 × speed, 17 / 16T or more is required. Note that 1 / 16T represents pulse resolution. As described above, it is necessary to adjust the pulse length in order to perform recording so that it can be properly reproduced. However, since it is necessary to satisfy the above-mentioned requirement of 2.0 ns for high-speed recording, there is a large room for adjusting the pulse length. It has become less.

  For this reason, it is considered to adopt a castle type recording pulse (hereinafter referred to as an L type recording pulse) such that Tlp = 0 which defines the last pulse length. FIG. 4 schematically shows an L-shaped recording pulse waveform. The top pulse is formed by outputting the write power Pw for a period of Ttop, and the period of the top pulse is adjusted by the start timing dTtop. The intermediate pulse is formed by outputting the intermediate bias power Pm for a period from the top pulse to the cooling pulse output with the cooling pulse power Pc, and the period of the intermediate pulse is adjusted by the end timing dTc. As shown by the dotted line, there is no last pulse.

  An example of an actual recording pulse waveform is shown in FIG. In FIG. 5, the horizontal axis represents time and the vertical axis represents power. Thus, it can be seen from FIG. 5 that the top pulse can be identified, but the last pulse does not exist, and a cooling pulse that is recessed downward immediately from the intermediate pulse appears. Since it is not necessary to form the last pulse, it is not necessary to require an excessive response performance for the laser to be used.

  Note that such an L-type recording pulse has been studied in Japanese Patent Application Laid-Open No. 2008-293644. However, the recording pulse needs to be adjusted depending on the type of optical disk and the material used, and the technique described in the above publication is not applicable to any case.

JP 2008-293644 A

  Thus, it is considered that the number of cases where high-speed recording using an L-type recording pulse waveform is performed increases. However, as shown in FIG. 5, the actual laser output waveform has a dull rising or falling waveform compared to the set strategy. This is considered to occur because the laser output cannot follow the strategy setting. Here, the intermediate bias power irradiation period from the end position of the top pulse, that is, the intermediate pulse, is shorter for shorter marks and longer for longer marks. Therefore, in the case of a long mark, the inclination of the fall of the laser output in the intermediate pulse is large, and in the case of a short mark, the inclination is small. For this reason, the shorter the mark, the larger the output error amount in the intermediate pulse. If the output error amount in the intermediate pulse is large, it can be said that the laser tends to be irradiated with an excessive output with respect to the set strategy in the intermediate pulse. Therefore, when a short mark is formed, it becomes difficult to control the position of the rear end portion and the width of the intermediate portion, which increases errors and jitter. On the other hand, when a long mark is formed, the change in the output of the intermediate pulse is relatively small, so that it can be said that the laser tends to be irradiated with a relatively appropriate output amount for the set strategy. However, when the laser output is adjusted to a short mark, the amount of heat for shaping the trailing edge of the mark is insufficient, so that the mark does not have an appropriate shape, and errors and jitter may increase.

  Accordingly, an object of the present invention is to provide a novel technique for ensuring good recording quality even when an L-shaped recording pulse waveform is employed.

  A data recording method according to an aspect of the present invention includes (A) a step of reading a media ID of an optical disc to be recorded, and (B) an absorption spectrum in which the read media ID can be recorded in a wavelength range of 400 to 410 nm. (B1) the last pulse width is set to 0 for all mark lengths including the shortest mark length nT (for example, n = 2). The intermediate bias power Pm in the intermediate pulse included in the special castle-type recording pulse waveform as described above with respect to the write power Pw in the top pulse included in the castle-type recording pulse waveform (that is, the L-type recording pulse waveform). The amplitude level of the playback signal corresponding to a mark of (n + 3) T or more is the same level as the longest mark mT. (B2) Further, when the recording parameter dTc that defines the application start timing of the cooling pulse in the recording pulse waveform defines the direction in which the application start timing is delayed as the negative direction, according to the ratio set in advance to be 0 > DTc at mark length (n + 1) T> dTc at mark length (n + 2) T ≧ dTc as set in advance so as to satisfy dTc at mark length (n + 3) T, Setting dTc at bias power Pm and mark lengths (n + 1) T to (n + 3) T.

  In most cases, the ratio Pm / Pw can be set to only one value for all marks, and in most cases, only one value can be set for the recording parameter dTc of (n + 3) T or more. In such a situation, it is important to stably adjust the recording of marks of (n + 3) T or more by first setting (b1). On top of that, for the marks of (n + 2) T or less, the setting as shown in (b2) can be made so that the amount of heat does not become excessive because the top pulse length cannot be adjusted much. . Therefore, recording quality is ensured.

  An optical disc recording / reproducing apparatus according to another aspect of the present invention has a means for reading a media ID of an optical disc to be recorded, and an absorption spectrum in which the read media ID can be recorded in a wavelength range of 400 to 410 nm. In the case of indicating an optical disc having a recording layer using an organic dye, the top included in the castle type recording pulse waveform in which the last pulse width is set to 0 for all mark lengths including the shortest mark length nT. The ratio of the intermediate bias power Pm in the intermediate pulse included in the castle type recording pulse waveform to the write power Pw in the pulse, and the amplitude level of the reproduction signal corresponding to a mark of (n + 3) T or more is the longest mark mT. In accordance with the ratio set in advance so that the same level as When the recording parameter dTc that defines the application start timing of the cooling pulse is defined as a negative direction that delays the application start timing, dTc> mark length (n + 2) at 0> mark length (n + 1) T Write power Pw, intermediate bias power Pm, and mark lengths (n + 1) T to (n + 3) T as preset so as to satisfy dTc at T ≧ mark length (n + 3) T Means for setting dTc.

  Furthermore, an optical disc according to still another aspect of the present invention is an optical disc including a recording layer using an organic dye having an absorption spectrum that can be recorded with a read media ID in a wavelength range of 400 to 410 nm. Intermediate bias in the intermediate pulse included in the castle type recording pulse waveform with respect to the write power Pw in the top pulse included in the castle type recording pulse waveform in which the last pulse width is set to 0 for all mark lengths including the mark length nT The ratio of power Pm or the reciprocal of the ratio, and the ratio or the ratio set in advance so that the amplitude level of the reproduction signal corresponding to the mark of (n + 3) T or more is the same level as the longest mark mT The reciprocal of When the recording parameter dTc that defines the recording is defined as a negative direction in which the application start timing is delayed, 0> dTc at the mark length (n + 1) T> dTc ≧ mark length at the mark length (n + 2) T The dTc in the mark lengths (n + 1) T to (n + 3) T that satisfies dTc in (n + 3) T is recorded.

  In the case of an optical disc on which such setting data is recorded, even when the setting data does not exist in the memory in the optical disc recording / reproducing apparatus, data recording can be performed appropriately.

  A program for causing a processor to execute the data recording method of the present invention can be created. The program can be a storage medium such as a flexible disk, an optical disk such as a CD-ROM, a magneto-optical disk, a semiconductor memory, or a hard disk, or It is stored in a non-volatile memory of a storage device or processor. Note that data being processed is temporarily stored in a storage device such as a processor memory.

  According to the present invention, good recording quality can be ensured even when an L-shaped recording pulse waveform is employed.

FIGS. 1A to 1C are diagrams for explaining a castle-type recording pulse waveform. FIG. 2 is a diagram showing an actual waveform of the castle-type recording pulse waveform. FIG. 3 is a diagram showing the relationship between the mark length and time at each recording speed. FIG. 4 is a diagram schematically showing an L-type recording pulse waveform. FIG. 5 is a diagram showing an actual waveform of the L-type recording pulse waveform. FIG. 6 is a diagram illustrating an example of a cross section of an organic BD-R. FIG. 7 is a diagram illustrating an example of a cross section of an organic BD-R. FIG. 8 is a diagram for explaining the theory in the embodiment. FIG. 9 is a diagram for explaining the setting of dTc in the present embodiment. 10A to 10D are diagrams illustrating an example of recording conditions. FIG. 11 is a diagram showing the amplitude level of a reproduction signal when recording is performed under the above recording conditions. FIG. 12 is a diagram showing the relationship between the ratio of the set write power to the optimum write power and the SER. FIG. 13 is a functional block diagram according to the embodiment of the present invention. FIG. 14 is a diagram showing a processing flow in the embodiment of the present invention. FIG. 15 shows a data structure on the optical disc.

[Optical disc used in the embodiment]
FIG. 6 shows a cross-sectional view of the optical disk used in the present embodiment. The optical disc according to the present embodiment is, for example, a write-once type organic Blu-ray disc (hereinafter referred to as “organic BD-R”) using an organic dye in the recording layer. In the organic BD-R 1011, a reflective layer 1003, a recording layer 1004, a protective layer 1005, and a cover layer 1006 are sequentially formed on the surface of the disc-like substrate 1002 on which the groove 1007 is formed. Alternatively, as shown in FIG. 7, the cover layer 1006b is attached to the laser light irradiation surface side of the protective layer 1005 via the adhesive layer 1006a. In such an organic BD-R 1011, a land 1008 is a portion formed between a groove 1007 formed in a spiral shape on the substrate 1002 and another groove 1007.

  Recording is performed by irradiating the recording layer 1004 on the groove 1007 with laser light when viewed from the laser light irradiation surface side. The reproduction of the organic DB-R 1011 recorded in the groove 1007 along the land 1008 is performed by irradiating the groove 1007 with the laser beam along the land 1008 and reading the reflected light to reproduce the recorded signal. . Since the reflectance of the portion not irradiated with the data recording laser light is low (Low) and the reflectance of the portion irradiated with the data recording laser light is high (High), the organic BD-R1011 is provided. Is a low-to-high (LtH) type optical disc. However, a reverse high-to-low (HtL) type optical disc may be used.

  In the present embodiment, data recording is performed using a short wavelength laser. The wavelength of this short wavelength laser may be 405 nm, but may be in a wider range around 405 nm, for example, 400 to 410 nm.

Further, for the recording layer 1004 of the organic BD-R 1011, for example, organic dyes that respond to the short wavelength laser as described above can be used.

  M is a divalent metal selected from 7A group, 8 group, 1B group, and 2B group of the periodic table, and nickel, cobalt, copper, zinc, manganese, and iron are particularly preferable. A forms a nitrogen-containing heteroaromatic ring, and B forms a structure having a saturated or unsaturated 5-membered ring (pentagon) to 7-membered ring (pentagon) hydrocarbon ring or condensed condensed ring.

[Theory of the embodiment]
In this embodiment, the shortest mark is 2T and the longest mark is 8T based on the BD (Blu-Ray Disc) standard.

  In the L-type recording pulse waveform, since the last pulse length Tlp = 0 as compared with the castle-type recording pulse waveform, the influence of excess laser power in the intermediate pulse is large, and the amplitude of the reproduction signal corresponding to each mark Variations in level and trailing edge position are likely to occur. However, in a relatively long mark of 5T (when the shortest mark is n = 2T, (n + 3) T.) Or more, the laser output at the intermediate pulse is relatively stable, and thus the variation in the position of the trailing edge is likely to be reduced. . Therefore, the ratio Pm / Pw is set so that the laser output in the intermediate pulse of the 5T to 8T marks converges to a substantially constant level and the amplitude level of the reproduction signal is equal (including the case where there is the same level and slight deviation). It is important to adjust. Thus, further adjustment can be performed with the recording parameter dTc that defines the start timing of the cooling pulse.

  FIG. 8 schematically illustrates the matters described above. As shown in FIG. 8, in the L-type recording pulse waveform, only the top pulse is applied in the case of the 2T mark, but in the case of the 3T to 8T mark, the intermediate bias power Pm is applied as shown by the dotted line. A period is provided. This intermediate bias power Pm is set at a ratio Pm / Pw. In FIG. 8, the behavior of laser output is schematically represented by a thick line. As shown in FIG. 8, for the 5T to 8T marks, as described above, the ratio Pm / Pw is experimentally adjusted in advance so that the laser output converges to a substantially constant level, and the amplitude of the reproduction signal Adjust so that the levels are equal.

  Further, as described in the background section, in addition to the influence of the dullness of the laser output waveform, the recording parameter Ttop (the top pulse rising timing is specified) that the top pulse length must be set to 2.0 ns or more. The shorter the mark, the more likely the laser output at the intermediate pulse will be excessive due to the problem of narrowing the degree of freedom of adjustment (dTtop adjustment). Therefore, by adjusting the recording parameter dTc for 3T and 4T marks, the influence of excessive laser output is reduced.

  At this time, the recording parameter dTc assists the adjustment by the ratio Pm / Pw so that the amplitude levels of the reproduction signals corresponding to the 5T to 8T marks become equal, and the dTc is advanced for the 4T mark and the 3T mark. Control is performed so as to shorten the time of irradiation with an excessive laser output. Accordingly, when the direction of delaying the falling timing of the intermediate pulse or the start timing of the cooling pulse is defined as a negative direction, 0> 3T mark dTc (denoted as dTc [3T])> 4T mark dTc (dTc [4T] It is set so as to satisfy dTc (denoted as dTc [5T]) at a ≧ 5T mark. If data recording is performed after such settings are made, it is possible to obtain an excellent recording characteristic by acting to cancel the influence of the laser output being dull at the top pulse end position. When the direction in which the falling timing of the intermediate pulse or the start timing of the cooling pulse is delayed is defined as a positive direction, 0 <dTc [3T] <dTc [4T] ≦ dTc [5T].

  Such setting of the recording parameter dTc is shown in FIG. As shown in FIG. 9, the recording parameter dTc is defined by the time 1T before the NT mark, that is, the time from (N-1) T, and is not set for 2T. As shown in FIG. 9, satisfying the condition as described above means that the length of the arrow A representing dTc [3T] for 3T, the length of the arrow B representing dTc [4T] for 4T, It can be seen that the length of the arrow C representing dTc [5T] for 5T is A <B <C according to 0 <dTc [3T] <dTc [4T] ≦ dTc [5T].

  For example, data recording was performed under the conditions shown in FIGS. 10A to 10D, and the recording quality was verified. As shown in FIG. 10B, the setting of the recording parameter dTc satisfies the conditions described above. Further, as shown in FIG. 10 (c), Tlp is set to 0, and it can be seen that it is an L-shaped recording pulse waveform. Furthermore, as shown in FIG. 10 (d), the ratio Pm / Pw is set, which is set in advance as described above. The setting shown in FIG. 10A is normally performed.

  FIG. 11 shows an example of measurement results of mark and space amplitude levels for each code (2T to 8T) with such settings. However, FIG. 11 uses a medium condition (Low-to-High) in which the return light intensity from the mark formation location is higher than the return light from the space portion, and the return light intensity from the mark formation location is space. When the medium condition (High-to-Low) that is lower than the return light from the unit is used, the magnitude relationship between the amplitude levels is reversed.

  From FIG. 11, the amplitude level of the reproduction signal corresponding to the mark 5T or higher is the same amount with reference to the mark 8T. Further, the amplitude level of the reproduction signal corresponding to the mark 4T is lower than the amplitude level of the reproduction signal corresponding to the mark 8T. The amplitude level of the reproduction signal corresponding to the mark 3T is also lower than the amplitude level of the reproduction signal corresponding to the mark 8T. However, when a high-to-low type optical disc is used, the mark and the space are inverted, and the space in FIG. 11 corresponds to the mark, so that the amplitude level of the reproduction signal corresponding to the space 4T is a space. It is lower than the amplitude level of the reproduction signal corresponding to 8T. The amplitude level of the reproduction signal corresponding to the space 3T is also lower than the amplitude level of the reproduction signal corresponding to the space 8T.

  Further, FIG. 12 shows the relationship between the ratio of the set write power to the optimum write power Pw and the SER (Soft Error Rate). The black diamonds represent the results of recording data on an optical disk using an organic dye with a castle-type recording pulse waveform, and the white triangles show the optical disk using an organic dye in FIGS. 10 (a) to 10 (c). The result when data recording is performed with an L-shaped recording pulse waveform according to the setting shown is shown. Thus, when data recording is clearly performed with an L-shaped recording pulse waveform, the SER is generally low, and good recording characteristics are obtained.

[Embodiment]
A functional block diagram of the drive system in the embodiment of the present invention will be described with reference to FIG. The drive system according to the embodiment of the present invention includes an optical disc recording / reproducing apparatus 100 and an input / output system (not shown) including a display unit such as a television receiver and an operation unit such as a remote controller.

  The optical disc recording / reproducing apparatus 100 records (A) a memory 127 for storing data in the middle of processing, data of processing results, reference data in processing, and (B) a program for performing processing described below. A control circuit 125 having a CPU (Central Processing Unit; also referred to as a processor) including a memory circuit 126, and (C) an interface unit (I / F) 128 that is an interface with the input / output system; D) A characteristic value detector 124 that detects the maximum amplitude level or minimum amplitude level of the RF signal that is a reproduction signal, and (E) the length direction of the nT mark with respect to an incomplete frequency response in which intersymbol interference remains. The amplitude level at the center position of the peak becomes a peak value, and the amplitude level that is affected by the adjacent nT space as the distance from the center position increases For example, an equalizer 131 for equalizing the value to a ratio of 7 levels from 0 to 6, for example, and (F) data demodulation for decoding the reproduced RF signal waveform-equalized by the equalizer 131 into the most probable standard code sequence A data modulation circuit 129 that performs predetermined modulation on data to be recorded output from the circuit 123, (G) the pickup unit 110, and (H) the control circuit 125, and outputs the data to the laser diode (LD) driver 121. And (I) an LD driver 121, (J) a rotation control unit and a motor of the optical disc 150, a servo control circuit 132 for the pickup unit 110, and the like. Although not shown, the optical disc recording / reproducing apparatus 100 is connected to a display device or a personal computer, and in some cases, may be connected to a network to communicate with one or a plurality of computers.

  The pickup unit 110 includes an objective lens 114, a beam splitter 116, a detection lens 115, a collimator lens 113, an LD 111, and a photodetector (PD) 112. In the pickup unit 110, an actuator (not shown) operates in accordance with the control of the servo control circuit 132, and focusing and tracking are performed.

  The control circuit 125 is connected to the memory 127, the characteristic value detection unit 124, the I / F 128, the LD driver 121, the data demodulation circuit 123, the data modulation circuit 129, the servo control circuit 132, a rotation control unit (not shown), and the like. In addition, the characteristic value detection unit 124 is connected to the PD 112, the control circuit 125, and the like. The LD driver 121 is connected to the data modulation circuit 129, the control circuit 125, and the LD 111. The control circuit 125 is also connected to the input / output system via the I / F 128.

  Next, an outline of processing when data is recorded on the optical disc 150 will be described. First, the control circuit 125 causes the data modulation circuit 129 to perform a predetermined modulation process on the data to be recorded on the optical disc 150, and the data modulation circuit 129 outputs the data after the modulation process to the LD driver 121. The LD driver 121 drives the LD 111 with the received data according to designated recording conditions (strategy data or the like) to output laser light. The laser light is irradiated onto the optical disc 150 through the collimating lens 113, the beam splitter 116, and the objective lens 114, thereby forming a mark and a space on the optical disc 150.

  An outline of processing when data recorded on the optical disc 150 is reproduced will be described. In accordance with an instruction from the control circuit 125, the LD driver 121 drives the LD 111 to output laser light. The laser light is irradiated onto the optical disc 150 through the collimating lens 113, the beam splitter 116, and the objective lens 114. The reflected light from the optical disk 150 is input to the PD 112 via the objective lens 114, the beam splitter 116, and the detection lens 115. The PD 112 converts the reflected light from the optical disc 150 into an electrical signal and outputs it to the characteristic value detection unit 124 and the like. The equalizer 131 and the data demodulating circuit 123 perform predetermined decoding processing on the output reproduction signal, and the decoded data is sent to the display unit of the input / output system via the control circuit 125 and the I / F 128. Output and display the playback data. The characteristic value detection unit 124 is not used in normal reproduction.

  Next, details of the data recording operation of the optical disc recording / reproducing apparatus 100 will be described with reference to FIG. First, the control circuit 125 reads out the media ID recorded on the optical disc 150 by reproducing it through the PD 112, the equalizer 131, and the data demodulation circuit 123 (step S1). Further, the control circuit 125 acquires data on the recording speed set by the user via, for example, the I / F 128 (step S3). Then, the control circuit 125 reads out the strategy data corresponding to the acquired recording speed and the read-out media ID from the memory 127 or the like, and sets it in the LD driver 121 (step S5).

  If the data is recorded on the optical disc 150 instead of the memory 127, the strategy data is read from the optical disc 150. Media ID for an optical disc having a recording layer using an organic dye having an absorption spectrum that can be recorded in a wavelength range of 400 to 410 nm when the recording speed is 6 times or higher (may be less than 6 times faster) Is read in this step, the initial value of the write power Pw and the Pm for Pw recorded in the memory 127 or the optical disc 150 according to the conditions described in the theory section of this embodiment. The intermediate bias power Pm and the recording parameter dTc determined from the initial value of the write power Pw are set in the LD driver 121 using the ratio and the recording parameter dTc. For example, if the corresponding media ID is registered in the memory 127 and the read media ID matches the registered media ID, it is determined whether the recording speed is appropriate.

  Then, the control circuit 125 or the like performs a known process for optimizing the write power Pw (step S7). At this time, the characteristic value detection unit 124 detects a characteristic value for calculating an asymmetry value or a β value and outputs it to the control circuit 125. The control circuit 125 calculates an asymmetry value or β value to calculate an optimum write power Pw. There are many optimization methods that can be used in this step, and any method may be used.

  Thereafter, the control circuit 125 compares the optimized write power Pw calculated in step S7 and Pw recorded in the memory 127 or the optical disc 150 according to the conditions described in the theory section of the present embodiment. Using the Pm ratio, the optimum value of the intermediate bias power Pm with respect to the optimum write power Pw is calculated, set in the LD driver 121, and data recording is performed (step S9). For the recording parameter dTc, the same value as that set in step S5 is used.

  By performing such processing, the effects described in the theory section of the embodiment can be obtained. Further, the write power Pw can be appropriately controlled in WOPC (Walking Optimum Power Control), ROPC (Running OPC), etc., and the intermediate bias power Pm with respect to the optimized write power Pw is also set. .

  Note that strategy data that satisfies the conditions described in the theory section of the embodiment may be stored in the memory 127 or may be stored in the optical disc 150. When it is held on the optical disc 150, it is held in the Lead-in area as shown in FIG. The Lead-in area includes a PIC (Permanent Information & Control Data) area 170, an INFO area, and an OPC area. For example, the PIC 170 holds the Pm ratio, Ps ratio, Pc ratio, etc. with respect to Pw that satisfy the conditions themselves and the conditions described in the theory section of the embodiment. Note that the BCA, DATA area, and lead-out area are the same as the conventional one.

  Although the embodiment of the present invention has been described above, the present invention is not limited to this. For example, the functional block diagram of FIG. 13 is shown for explaining the embodiment, and may not necessarily match an actual circuit or module configuration. In addition, as for the processing flow, as long as the processing result is the same, the processing order may be changed, or the processing order may be executed in parallel.

100 Optical Disc Recording / Reproducing Device 110 Pickup Unit 111 LD
112 PD 113 Collimating lens 114 Objective lens 115 Detection lens 116 Beam splitter 121 LD driver 123 Data demodulating circuit 124 Characteristic value detection unit 125 Control circuit 126 Memory circuit 127 Memory 128 I / F 129 Data modulation circuit 131 Equalizer 132 Servo control circuit 150 optical disc

Claims (4)

Reading the media ID of the optical disc to be recorded;
When the recording speed is 6 times or higher and the read media ID indicates an optical disc having a recording layer using an organic dye having an absorption spectrum that can be recorded in the wavelength range of 400 to 410 nm. In the intermediate pulse included in the castle type recording pulse waveform with respect to the write power Pw in the top pulse included in the castle type recording pulse waveform in which the last pulse width is set to 0 for all mark lengths including the shortest mark length nT. According to a ratio set in advance so that the amplitude level of the reproduction signal corresponding to the mark of (n + 3) T or more is the same level as the longest mark mT, which is the ratio of the intermediate bias power Pm, the recording pulse waveform The recording parameter dTc defining the application start timing of the cooling pulse in FIG. When the direction in which the timing is delayed is defined as a negative direction, 0> dTc in mark length (n + 1) T> dTc in mark length (n + 2) T ≧ dTc in mark length (n + 3) T Setting dTc at the write power Pw, the intermediate bias power Pm and the mark lengths (n + 1) T to (n + 3) T,
A data recording method including: Reading the media ID of the optical disc to be recorded;
When the recording speed is 6 times or higher and the read media ID indicates an optical disc having a recording layer using an organic dye having an absorption spectrum that can be recorded in the wavelength range of 400 to 410 nm. In the intermediate pulse included in the castle type recording pulse waveform with respect to the write power Pw in the top pulse included in the castle type recording pulse waveform in which the last pulse width is set to 0 for all mark lengths including the shortest mark length nT. According to a ratio set in advance so that the amplitude level of the reproduction signal corresponding to the mark of (n + 3) T or more is the same level as the longest mark mT, which is the ratio of the intermediate bias power Pm, the recording pulse waveform The recording parameter dTc defining the application start timing of the cooling pulse in FIG. When the direction in which the timing is delayed is defined as a negative direction, 0> dTc in mark length (n + 1) T> dTc in mark length (n + 2) T ≧ dTc in mark length (n + 3) T Setting dTc at the write power Pw, the intermediate bias power Pm and the mark lengths (n + 1) T to (n + 3) T,
For causing the processor to execute Means for reading the media ID of the optical disk to be recorded;
When the recording speed is 6 times or higher and the read media ID indicates an optical disc having a recording layer using an organic dye having an absorption spectrum that can be recorded in the wavelength range of 400 to 410 nm. In the intermediate pulse included in the castle type recording pulse waveform with respect to the write power Pw in the top pulse included in the castle type recording pulse waveform in which the last pulse width is set to 0 for all mark lengths including the shortest mark length nT. According to a ratio set in advance so that the amplitude level of the reproduction signal corresponding to the mark of (n + 3) T or more is the same level as the longest mark mT, which is the ratio of the intermediate bias power Pm, the recording pulse waveform The recording parameter dTc defining the application start timing of the cooling pulse in FIG. When the direction in which the timing is delayed is defined as a negative direction, 0> dTc in mark length (n + 1) T> dTc in mark length (n + 2) T ≧ dTc in mark length (n + 3) T Means for setting the write power Pw, the intermediate bias power Pm, and dTc in the mark lengths (n + 1) T to (n + 3) T,
An optical disc recording / reproducing apparatus having: An optical disc comprising a recording layer that uses an organic dye having an absorption spectrum that can be recorded at a recording speed of 6 times or higher and that has a read media ID in a wavelength range of 400 to 410 nm,
For all mark lengths including the shortest mark length nT, the write pulse Pw included in the castle-type recording pulse waveform whose last pulse width is set to 0 is intermediate in the intermediate pulse included in the castle-type recording pulse waveform. The ratio of the bias power Pm or the reciprocal of the ratio, and the ratio set in advance so that the amplitude level of the reproduction signal corresponding to the mark of (n + 3) T or more becomes the same level as the longest mark mT or The reciprocal of the ratio is recorded,
Further, when the recording parameter dTc that defines the application start timing of the cooling pulse in the recording pulse waveform defines a direction in which the application end timing is delayed as a negative direction, 0> dTc at the mark length (n + 1) T> DTc at mark lengths (n + 1) T to (n + 3) T that satisfies dTc at mark length (n + 2) T ≧ dTc at mark length (n + 3) T is recorded.
optical disk.

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